I am sure there are many, many charts and graphs which go upwards 2012 onwards and align with women becoming more liberal. You can point to any of them and say that's the cause.
The reality is: men and women comingle less than ever, have less sex, have fewer partners, get married less often, and get divorced less often. My generation is the most sexless generation in human history. The myth of the 1000 body woman (only counting humans XD) is a cruel joke that has been played on people and taken seriously, and the reality is that men have more partners than women and always have.
You can summarize the liberalization of women very briefly and thusly:
Men and women interact less than ever, understand each other less than ever, respect each other less than ever, and liberalism offers women independence from the men they don't understand and who do not respect them.